The tables assign a rarity value to each unit in
Combat Mission with 1 being a very common unit and 8 being a very rare
unit. The idea is that players may choose which rarity level they want
to fight their battle under and then only purchase units with that
rarity number or less.

There may situations where a purchased formation
contains a unit with an invalid rarity number. In these cases the unit
would be allowed so long as it wasn't purchased individually.

Example: Two players agree to play a rarity 3
game. The German player purchases a Heer Rifle Battalion which contains
a 120mm Mortar Spotter which is a rarity number 5 unit. Even so, this
120mm Mortar Spotter is allowed since it comes with the battalion.
However, a second individual 120mm Mortar Spotter could not be purchased
since it would be restricted by its number 5 rarity.